I'm on my laptop right now and I just clicked on the link I posted here and registered and you're right,when you do a search it can't be found.I stayed logged in to tubi and opened another page on chrome and typed in "Frankie and Alice on Tubi",the first result that came up I clicked on and then just had to click play.Weird.Try that and see if it works.

ETA.Maybe an easier way is to just do a Google search of frankie and alice on tubi and then click the first result that comes up.It says you must be signed in to watch.Sign in and there ya go.

Let me know if it works for you.It definitely works for me.